Opegrapha  viridis Pers.
Status of species A very rare species. Included in the List of endangered lichens species in Poland. 
Distribution Central and western parts of Latvia.
Habitat An epiphytic lichen occuring on smooth bark of deciduous trees.
Occurance Singly specimens occur on tree bark.
Reproduction By spores.
Changes in number and distribution Found for the first time in Latvia in Ķemeri (A. Bruttan, 1870) and in Moricsala reserve (A. Piterāns, 1972). It is negatively affected by changs biotope and the environmental pollution.
Existing protection A locality is known in Moricsala reserve. Red Data Book of Latvia, 1992.
Suggestions for study Lichen biology and dynamics of population development should be studied. Its distribution should be defined.
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